Exodus 12:10-12 Revised Standard Version (RSV)
10 And you shall let none of it remain until the morning, anything that remains until the morning you shall burn. 11 In this manner you shall eat it: your loins girded, your sandals on your feet, and your staff in your hand; and you shall eat it in haste. It is the Lord’s passover. 12 For I will pass through the land of Egypt that night, and I will smite all the first-born in the land of Egypt, both man and beast; and on all the gods of Egypt I will execute judgments: I am the Lord.